Plunger and piston construction for molding-machines.



P. W. GATES. PLUNGER AND PISTON CONSTRUCTION FOR MOLDING MACHINES.

APPLICATION FILED DEC. 18; I9I5.

ohm 1 9 1 O 2 e H H J d e ru H e t a D1 all JPHILJETUS W. GATES, OF CHICAGO, ILLINOIS, ASSIGNOR T MUMFOJRD MOLDING MACHINEGOMPANY, 0F JERSEY CITY, NEW JERSEY, A COEPORATIONDF NEW PLUNGER AND PISTON CONSTRUCTION FOR MOLDING-MACHIN ES.

inea.

To all whom it may concern:

a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Plunger and Piston Construction for Molding-.Machines, of which the following is a specification.

This invention relates to improvements in plunger and. piston construction for molding machines or the like.

The object of this invention is to provide a coacting cylinder and plunger utilizing oil or similar fluid for a direct actuating means, together with air or other gaseous fluid to actuate the heavier fluid.

My invention resides in the specific ar-. rangement and construction of the parts, as hereinafter set forth and described in the specification and shown in the accompanying drawing, in which:

Figure 1 is a' vertical section of my invention, a portion of the plunger being shown in elevation; Fig. '2 is a. transverse horizontal section taken along the line 2-2 of Fig. 1; and Fig. 3 is a plan view of the structure shown in Fig. 1.

Like numerals refer to like elements -36 throughout the drawings.

10 designates generally my cylinder provided with a movable base 12 secured thereto by screws 12*, or the like, and peripherally flanged at 10 to permit the attachment of the gland follower 13, the same being secured thereto by. screws 13,

this construction constituting a well known form of stufiing box or gland. The cylinder 10 is further provided with the boltlng flange 1O with bolting apertures 10 therethrough, see Fig. 2. An air inlet 10 is provided in the walllof the cylinder 10, and an" airtube 14 is threaded thereinto to furnish a supply of air, steam, or the like. Reciprocally'mounted in the cylinder 10 is the plunger or piston 15 formed with the table portion'15 at its upper extremity and internally chambered, as indicated at 15*. The bottom of the plunger is provided with a threaded aperture into which is threaded the plug 16 provided with the aperture 16.

Specification of Letters Patent.

Patented am an, iaie.

Application filed December 18, 1915. Serial No. 67,607.

Oil or similar fluid is carried in the chamber 15", the same constituting in effect a reservoir, and the same may flow from the chamber 15 through apertures 16 into the clearance space 10 beneath the plunger 15. An inlet 15 leads through the wall of the plunger 15 to the chamber 15 above the level of the oil or other fluid therein, as shown in Fig. 1. It will be. apparent that air or similar operating fluid flowing through passage 14.- and through inlet 15 will exert pressure against the heavier fluid and the top of reservoir 15 and raise the plunger the oil flowing out from the chamber 15 through aperture 16- into the cylinder 10, thereby operating to raise the plunger 15 in the cylinder. To insure flow of air into the chamber 15 during the rise or in raised position of the plunger 15, I provide the longitudinal groove 15 in the side wall thereof, as shown in Figs. 1 and 2, the ap- Y e'rtureor inlet 15 'opening from the top of this groove, as shown in Fig. 1. The groove. 15 is in communication with the inlet 10", as will be apparent and air flowing therethrough into the groove 15 will flow from the latter through inlet 15 into the chamber 15*, as will be apparent. On the return stroke of the plunger the oil will flow through the restricted aperture 16 into chamber 15 providing a dampening or dashpot action, the air being expelled through inlet 14.

' While I contemplate using my invention in connection. with molding machinery, I do not wish my invention to-be restricted to such use, nor do I wish it to be restricted to the embodiment of my invention shown' 2. In combination, a cylinder having an viding communication between said cylinair 'inlet in the side thereof, a plunger der and plunger air inlets. 10 mounted therein, said plunger being con- In testimony whereof, I have subscribed structed with a fluid reservoir, and a my name.

5 fluid duct leading to said cylinder beneath PHILETUS W. GATES.

said plunger, said plunger being further Witnesses: 4 provided with an air inlet leading to said JAMES T. LEE, reservoir, and a duct or passageway pro- R. H. WOODLAND. 

